Running calculators

All free. No sign-up required.

Pace Calculator

Convert min/km, min/mile, and km/h. Includes finish time predictions for 5K to marathon.

Predict your marathon or half from any known race result using the Riegel formula.

Calculate your 5 HR training zones with Karvonen or % of max HR method.

Estimate VO2 max and VDOT from any race time. See equivalent performances.

Check your BQ time by age group and gender with cutoff buffer analysis.

Generate per-km splits for even, negative, or positive split strategies.

MET-based calorie estimate by distance, pace, and body weight.